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        <title>Document</title>
        <script>
            var cn;
            //= document.getElementById('cw');
            var c;
            var u = 10;
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            function gc() {
                var s = "0123456789ABCDEF";
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                c.lineWidth = "2";
                c.globalAlpha = 0.5;
                resize();
                anim()
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                resize();

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                cn.width = innerWidth;
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                    this.y = m.y + Math.sin(this.theta) * this.t;
                    c.beginPath();
                    c.lineWidth = this.r;
                    c.strokeStyle = this.cc;
                    c.moveTo(ls.x, ls.y);
                    c.lineTo(this.x, this.y);
                    c.stroke();
                    c.closePath();

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            function anim() {
                requestAnimationFrame(anim);
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        <style>
            #cw {
                position: fixed;
                z-index: -1;
            }

            body {
                margin: 0;
                padding: 0;
                background-color: rgba(0,0,0,0.05);
            }
        </style>
    </head>
    <body>
        <canvas id="cw"></canvas>
        qwerewr    

    </body>
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